Ophthalmic mounting



J. w. WELSH OPHTHALMIC MOUNTING Nov. 6, 1928. 4

Filed April 16, 1925 lNVENTOE 0607a: A/. 1/9/65 Patented Nov. 5, l928.

uurreo STATESPATENT OFFICE.

JAMES EVILSDN WELSH, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO BAUSGI'I AND LOMB OPTICAL GOIIIPAN Y, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW" YORK.

OPHTHALMIC MOUNTING.

The present invention, thouo'h having also other fields of usefulness, relates more particula rly to ophthalmic mountings and methods of making the same. From a more lunited aspect, the invention relates to ophthalmic mountings con'iprisinp; endless, circular lens-holding rims, and more particularly to mountings of the all-shell type, constituted of non-metal material. like celluloid, Zylonitc and the like.

A source of difiiculty with ophthalmic mountings the lens-receiving grooves of which are circular is that the lenses tend to rotate in their grooves. A number of proposals have been made to prevent this rotation, many of which have had to do with a metal member projecting, from the wall of the groove and into engagement with a notch provided in the periphery of the lens. The projection thus locks the lens against rotation. Some proposals have had to do with a permanently embedded metal member; and others with a removable member; The former has been found to be commercially impractical; and removal metal members, though answering the requirements well, have been found, sometimes, to project too far into the lens-receiving groove, and, at other times, not far enough. In either case, the task of the optici an who inserts the lenses in their grooves has been made, by so much, the more diflicult.

A chief object of the present invention is to improve upon lens looks of the above-de scribed character. Other and further objects will be explained hereinafter and will be particularly pointed out in the appended claims.

According to the present invention. the op tician is enabled to determine for himself just how far the lens-locking member shall projectfrom the wall of the lens-receiving groove. He is thus freed from the arbitrary caprice of the manufacturer who supplies him with the ophthalmic mountings. Not only this, but the opticianmay permanently secure the lens-lock in just the desired position, and projecting neither too far from nor too near to the wall of the lens-receiving grove. The advantages of a removable locking member are thus combined with those of the permanently embedded member, without the disadvantages of either.

The invention will be explained in connection. with the accompanying drawings in which Fig. 1 is a fragmentary elevation,

partly in section, of an ophthalmic mounting, illustrating a step in the preferred method of thepresent invention; and Flg. 2 is a similar View illustrating the ophthalmic mounting of the present invention in its preferred form. 7

Ophthalmic mountings of the above-described character, constituted of non-metal material, like celluloid, zylonite and the like, comprise two endless rims 2 integrally connected together by a bridge-ft, and each having integral temple. end pieces 14. The bridge and the end pieces need not, however, be in tegral. They may be made of metal or other material and they may be attached to the rims in any well-known manner. I

The lens-receiving grooves 8 of the rims 2 are generally circular, as shown. Lenses 6 -mounted in such grooves have a tendency to This tendency exists even when the To prevent turn. rims are not, strictly, circular.

the rotation of the lens, the mountings have.

been provided with members 18, projecting from the walls of the grooves 8 and into a notch 27 in the lens. These members 18 have been of metal. Their defects and limitations have been mentioned above.

According to the presentinventiomthelensreceiving groove 8 is provided with a cylindrical. notch 25. positioned preferably near the end piece 14. The mounting; is supplied to the Optician already provided with these notches 25, one in each rim. The notches 25 may be made by drilling. or in any other desired way. If the patient requires a spherical lens, the rotation of which is not harmful, the notch 25 is disregarded. and the lens is mounted in position as though the groove 8 were not provided with the notch 25. In cases where the patient requires a type of lens that must be fixed againstrotationfhowever. the Optician. after notching the lens at 27 so as to register with the notch 25 in the mounting, inserts the end of a cylindrical rod 10 into the notch and cuts it oil at 12, so that the cut portion shall project beyond the walls of the groove 8 just the right distance so as to enter the notch 27, and not too far or too little. The optician may thus make the notch 27 of such dimension as hardly to be noticeable. when the mounting is worn on the It is preferred to have the rod =consti-, tut-ed of the same awn-metal anateriail :as the material of the mounting, like celluloid, z ylonite andthe like. Thematerial is very easily cutat 12; and there is the further advantage that the plug '18 maybe integrally connected to the material of the mounting. The plug may, for example, be cemented rigiclly in place in the notch if tlie encl of'the rod 10- is dipped in a suitable solvent, like acetone,

"beforezit is -positioned in the notch 25i 1 -The climensio ns may be varied in accorcL zan'ce'with conditionsyibut zit is found that a 'verye fi ective lenss'look T111131 be pro clucecl,v

, extend about two millimeters. er the 'noteh ma 1 beiabont six liunclrecltlrs of aniinch;

the lockinguplng -1'8 and notch "27 not which 7 :are ill ardlay noticeable by ha ing 'the 1plugl8 "It will 'be iunclerstootl thatthe invention is -:not restricted to the exact emboclimeiitthereof-ithat is illustrated in the accompanying drawings and described l1'erei-n,:and thatra'll modifications Within the skill of ithe "artisan -'areco11sicl-eretlto'be Within thespirit} and scope *of the "presentfl-n entio'n, 'asdefined an the appended claims.

- :Whatiisiclaimedas:

1.5 An ophthalmic. mounting 'having a lens- -recei-ving, grooveprovided with la. notch, the

n walls .of-the groove and of thenotch compris- 111g-nonnnetalmaterial anclamonnnetal,mem-

ber rigidly seated'in the notolrancl rigidly mitecl 'with the inon-metal material, the =nonuneta'l l'mem'ber qarojecting from 'the 'Wall {of The diameter van ophthalmic@mounting having a lensqteiceiving groove,-the wall of which comprises men-metal material, the said methodlcompria 'ing notchingithe wall of the groove, inserting a rnon-wmetal member :in the :notch, .and .inteuniting the member with the non-metal v niaterial, the memberprojecting from the wall of the groove and being'adaptecl-to :engage a lens. 7 Q l v 4. :Aunethotlof ,providing .With aliens lock :an :ophthalmic :mounting 7 having lens-receiving groove lthe wall of which comprises non-metal material thesaid methoclvcomprisling notchingthe wall "o ithe;groovginsorting Qa non-metal member iII i'ilIB'IlOtGlI,GUttlIlgiLllQ membeinat a-pointrsuchithatithe portion ,oftlie unember projecting from the match will ibe adaptedto :act a lens lock,ancl integrally uniting the-member ivithlthe nonvmetal ma- 14 V l aerial.

Initestimony whereof, .I haveherennto, subv-scr1be'd'm 'y name. I

JAMES w, 

